I found out my Droid has a max width of 800 pixels, which I think some lower-resolution computers are smaller than, but I want my Droid to display the mobile CSS, so I am not sure max device width is the best solution. So does anybody know how I'd design my CSS link tags so that the mobile CSS is used only by smartphones while the desktop CSS is used only by desktop computers (including the kind with a width under 800px)?